基于桩土相互作用的抗滑圆桩影响参数研究

Study on the influence parameters of anti-sliding round pile based on pile-soil interaction

摘要

抗滑桩是一种广泛运用于提高边坡稳定性的支护措施，合理选择抗滑桩参数，对于提高边坡稳定性、节省成本具有重要意义。以甘洛县某小型滑坡为研究对象，利用FLAC ^3D数值分析软件，考虑桩径与桩间距两项设计参数对桩土相互作用的影响，分析了桩径和桩间距对抗滑圆桩受力变形的影响和对滑坡的加固效果。结果表明：随着桩间距的增大，滑坡推力、桩前抗力、桩身位移、坡体最大位移和桩身内力逐渐增大，抗滑圆桩加固后的滑坡稳定性随桩间距的增大而逐渐降低，桩间距不宜超过6.25 m方可保证桩土的协调作用。随着桩径的增大，滑坡推力、桩前抗力、桩身位移和坡体最大位移逐渐降低，抗滑圆桩加固后滑坡稳定性、桩身内力随桩径的增大而逐渐增大，桩径应不小于1 m且最大桩径宜取1.5 m。

Abstract

Anti-slide piles are widely used as a support measure to improve slope stability. The reasonable selection of anti-slide pile parameters is crucial for enhancing slope stability and reducing costs. A small landslide in Ganluo County is taken as the research object and FLAC^3D numerical analysis software is used to investigate the effects of pile diameter and pile spacing on pile-soil interaction. It is analyzed how these two parameters influence the deformation of circular anti-slide piles and their reinforcement effects on landslides. The results indicate that as the pile spacing increases, the landslide thrust, front resistance of the pile, pile displacement, maximum slope displacement, and internal force within the pile all gradually increase. Meanwhile, the stability of the landslide reinforced with circular anti-slide piles decreases with increasing pile spacing. To ensure effective pile-soil interaction, the pile spacing should not exceed 6.25 m.Furthermore, as the pile diameter increases, the landslide thrust, front resistance of the pile, pile displacement, and maximum slope displacement gradually decrease. After reinforcement with circular anti-slide piles, the landslide stability and internal force within the pile increase with the pile diameter. The pile diameter should be no less than 1 m, with an optimal maximum diameter of 1.5 m.

关键词

抗滑桩 / 滑坡治理 / 数值模拟 / 桩间距 / 桩径 / 桩土相互作用

Key words

Anti-slide pile / Landslide control / Numerical simulation / Pile spacing / Pile diameter / Pile-soil interaction

Author summay

杨 松(1976—), 男, 高级工程师, 学士, 主要从事工程建设与研究工作。E-mail: [e-mail]

基金资助

国家自然科学基金项目(51178402)